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Investigators in the Aaron Hernandez murder case had reportedly hoped to interview his cousin's husband who died early Sunday morning in a high-speed car crash in Bristol, Conn.

Police say 33-year-old Thaddeus Singleton III of Bristol was killed when the car he was driving slammed into the Farmington Country Club early Sunday morning. The Hartford Curant reported that investigators wanted to speak to Singleton because of his relationship with Hernandez.

Singleton is married to Hernandez's cousin, and police say the car involved was registered to Hernandez's uncle.  Their home has been searched several times by Massachusetts police investigating a 2012 double homicide linked to the former NFL star.

Police seized a vehicle from that home on Friday.

The cause of the accident has not been determined. Police said a woman in the car was in the hospital with non-life-threatening injuries. Her name has not been released.

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Meanwhile, investigators continue to gather and search for more evidence as Hernandez remains in a jail cell charged in the murder of 27-year-old Odin Lloyd, of Dorchester, MyFoxBoston.com reported.

Police documents show that police located a white hooded-sweatshirt and a baseball cap allegedly worn by Hernandez the night Lloyd was murdered at an apartment Hernandez rented in Franklin.

Investigators said they also found a valet parking ticket from the W Hotel, which is within walking distance of the Rumor nightclub.

It's at that nightclub prosecutors allege Hernandez orchestrated Lloyd's murder because he was angry with Lloyd about something Lloyd had said to people at the club that Hernandez did not like.

Police say they also found ammunition in the condo, including .45-caliber ammo – the same caliber as the handgun used in the murder. All of it could be key pieces of evidence as the investigation into another case involving Hernandez is expanding into Connecticut.

Boston police now confirm they have asked police in Bristol, Conn., to assist in the investigation into a double murder in the South End.

Last week, police searched a home in Bristol for evidence in this case, as well as the murder of Lloyd, for which Hernandez is already charged

A vehicle was seized from the home. And Hernandez's former college teammate and current Patriots player, Tim Tebow, apparently was a witness in another Hernandez incident in Florida several years ago. The two were at a bar called The Swamp in Gainesville back in 2007.

According to police reports, Hernandez got into a scuffle with an employee about the bill and allegedly punched the worker in the head, rupturing the man's eardrum. Tebow's listed as a witness on the police report. The two played football at the University of Florida together. Tebow told police he tried to break them up before the argument got physical.

Also in 2007, Hernandez was among three Florida football players and another who had gone on to the NFL questioned by Gainesville police after a double shooting that happened after a Florida loss. Police said the players provided the information investigators wanted. No charges were ever filed.

A request for comment left with a spokesman for Hernandez's legal team Tuesday evening was not immediately returned.